Audio mixer



FIG. 1 is a perspective view of an audio mixer showing our new design;

FIG. 2 is a top plan view thereof;

FIG. 3 is a front view thereof;

FIG. 4 is a bottom plan view thereof;

FIG. 5 is a left side view thereof;

FIG. 6 is a right side view thereof;

FIG. 7 is a rear view thereof; and,

FIG. 8 is a front view thereof, shown in a turned-on state. 

The ornamental design for an audio mixer, as shown and described. 